Compilare: user.cpp: In constructor ‘trie::trie()’: user.cpp:26:36: warning: passing NULL to non-pointer argument 2 of ‘void* memset(void*, int, size_t)’ [-Wconversion-null] memset(nod,NULL,sizeof(nod)); ^ user.cpp: In function ‘bool gs()’: user.cpp:36:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<x.size();++i) ~^~~~~~~~~ user.cpp: In function ‘void baga()’: user.cpp:51:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<x.size();++i) ~^~~~~~~~~ user.cpp: In function ‘void qu(int, int)’: user.cpp:63:9: warning: unused variable ‘sol’ [-Wunused-variable] int sol=1; ^~~